scholarly journals Pembuatan Meja Bak Cuci Tangan Menggunakan Mutu Beton Sederhana dengan Memanfaatkan Limbah Olahan Rotan dan Sosialisasi Cuci Tangan 6 Langkah di Panti Asuhan Budi Mulya Kota Palangka Raya

2021 ◽  
Vol 6 (2) ◽  
pp. 156-163
Author(s):  
Rida Respati ◽  
Nirwana Puspasari ◽  
Hendra Putra Jaya ◽  
Ridho Saleh Silaban ◽  
Ari Widya Permana
Keyword(s):  
Reinforced Concrete ◽  
Water Storage ◽  
Concrete Mixture ◽  
Running Water ◽  
Central Kalimantan ◽  
Fast Spreading ◽  
Storage Basin ◽  
Waste Mixture

The development of coronavirus or Covid-19 in Central Kalimantan is currently increasingly worrying. All areas in this province are now in red zone status. This transmission is very fast spreading, so we are doing outreach to the community at Budi Mulya Orphanage, Palangka Raya City, implementing 6 recommended handwashing steps to kill the Covid 19 virus that sticks to our fingers. Washing hands with soap is one of the sanitation measures to prevent disease. Even WHO also recommends 6 steps in washing the palms of hands, the palms of backs of hands, between the fingers, the backs of hands, the thumbs, and the tips of fingers. The last method of washing hands is to clean soap with running water and dry it. To support the 6-step handwashing program, we are working with the orphanage's leadership to make a table for a water storage basin used for washing hands. The table is made permanent, made of reinforced concrete, whose composition of the reinforced concrete mixture is mixed with processed rattan waste that is no longer used as a substitute for concrete fiber. The rattan waste mixture used was 0.25% of the total volume of concrete.

scholarly journals The Effect of the Morphology of Coarse Aggregate on the Properties of Self-Compacting High-Performance Fibre-Reinforced Concrete

Materials ◽  
2018 ◽  
Vol 11 (8) ◽  
pp. 1372 ◽  
Author(s):  
Krzysztof Ostrowski ◽  
Łukasz Sadowski ◽  
Damian Stefaniuk ◽  
Daniel Wałach ◽  
Tomasz Gawenda ◽  
...  
Keyword(s):  
Reinforced Concrete ◽  
High Performance ◽  
Coarse Aggregate ◽  
Fresh Concrete ◽  
Physical And Mechanical Properties ◽  
Concrete Mixture ◽  
Rheological Parameters ◽  
Transverse Strain ◽  
Fibre Reinforced Concrete ◽  
High Performance Fibre

When understanding the effect of the morphology of coarse aggregate on the properties of a fresh concrete mixture, the strength and deformability of self-compacting high-performance fibre-reinforced concrete (SCHPFRC) can be seen to be critical for its performance. In this research, regular and irregular grains were separated from granite coarse aggregate. The morphology of these grains was described while using digital image analysis. As a result, the aspect ratio, roundness and area ratio were determined in order to better understand this phenomenon. Then, the principal rheological, physical, and mechanical properties of SCHPFRC were determined. The obtained results indicated that the morphology of the grains of coarse aggregate has an impact on the strength and stiffness properties of SCHPFRC. Moreover, significant differences in the transverse strain of concretes were observed. The morphology of the coarse aggregate also has an impact on the rheological parameters of a fresh concrete mixture. To better understand this phenomenon, the hypothesized mechanism of the formation of SCHPFRC caused by different morphology of coarse aggregate was proposed at the end of the article.

scholarly journals PENGARUH PENGGUNAAN LIMBAH PLASTIK POLYPROPYLENE (PP) SEBAGAI CAMPURAN AGREGAT KASAR TERHADAP KUAT TEKAN DAN TARIK PADA BETON FC’ 25 MPA

2019 ◽  
Vol 3 (2) ◽  
pp. 81-89
Author(s):  
Angga Pirman Firdaus ◽  
Jonbi
Keyword(s):  
Tensile Strength ◽  
Compressive Strength ◽  
Strength Test ◽  
Plastic Waste ◽  
Concrete Mixture ◽  
Strength Testing ◽  
Concrete Compressive Strength ◽  
Tensile Strength Test ◽  
Compressive Strength Test ◽  
Waste Mixture

Indonesia ranks second in the world's largest plastic waste producer after China. Each year, Indonesia can contributeup to 187.2 million tons of plastic waste, while China reaches 262.9 million tons of plastic waste. Based on the data, one way to utilize plastic waste by using plastic waste as a mixture of concrete, where the plastic used is polypropylene (PP) plastic with different percentage of concrete mixture, the test includes compressive strength test and tensile concrete. The results of concrete compressive strength testing with polypropylene (PP) plastic waste mixture of 5%, 10% and 15% at age 28 in aggregate aggregate mixture decreased by 5.15%, 6.89% and 13.53%. As for the result of concrete tensile strength test with polypropylene (PP) plastic waste mixture of 5%, 10% and 15% at age 28 in crude aggregate mixture decreased 17,61%, 24,13% dan 23,24%.

Light Design of Small Towns’ Coastal Areas

2021 ◽  
pp. 51-54
Author(s):  
Oleg G. Maksimov ◽  
Olga Yu. Zaripova
Keyword(s):  
Cultural Heritage ◽  
Water Storage ◽  
Small Towns ◽  
Coastal Areas ◽  
Town Development ◽  
Experimental Project ◽  
Storage Basin ◽  
Effective Use ◽  
The Town ◽  
Functional Concept

This paper touches upon the problems of development and illumination of small Russian towns located on the banks of rivers and water storage basins (as exemplified by master’s theses). These problems lie on the plane of preservation and effective use of architectural, historical, and cultural heritage of towns, their unusual aura and colour. In the experimental project of town development based on the town of Yurievets situated on the bank of Volga water storage basin, the authors propose an architectural-spatial functional concept of filling up the town territory with the ideas on original colour and light design in the evening and at night.

DURABILITY PERFORMANCE AND DIMENSIONAL STABILITY OF POLYPROPYLENE FIBER REINFORCED CONCRETE

2018 ◽  
Vol 13 (2) ◽  
pp. 20-41 ◽  
Author(s):  
Ali Mardani-Aghabaglou ◽  
Süleyman Özen ◽  
Muhammet Gökhan Altun
Keyword(s):  
Reinforced Concrete ◽  
Dimensional Stability ◽  
Polypropylene Fiber ◽  
Pulse Velocity ◽  
Fiber Reinforced Concrete ◽  
Concrete Mixture ◽  
Fiber Reinforced ◽  
Concrete Mixtures ◽  
Durability Performance ◽  
Polypropylene Fiber Reinforced Concrete

In this study, the durability performance and dimensional stability of polypropylene fiber reinforced concrete mixture were investigated. For this purpose, two series of concrete mixtures, including a 0.45 water/cement ratio was prepared both in the absence and presence of fiber. A CEMI 42.5 R type portland cement and crushed limestone aggregate with a maximum particle size of 25 mm were used. In addition to the control mixture without fiber, three different concrete mixtures were prepared by adding polypropylene fiber as 0.4%, 0.8% and 1% of total volume into the mixture. The time-dependent fresh state properties, strength, ultrasonic pulse velocity, transport properties, drying shrinkage and freeze-thaw resistance of concrete mixtures, sodium sulfate attack and abrasion were investigated comparatively. Test results demonstrated that utilization of fiber affected the fresh properties of the concrete mixtures negatively. However, the 0.8% fiber-bearing mixture showed the highest performance in terms of durability and dimensional stability. Beyond this utilization ratio, the durability performance of the concrete mixture was negatively affected. The risk of nonhomogeneous dispersion of the fiber in the mixture was relatively high in the excess fiber-bearing mixture. Consequently, with the formation of flocculation in the mixture the void ratio of concrete mixture increased.

Corrosion Performance of Steel Rebars in the Roof of a 65-Year-Old Underground Reinforced Concrete Water-Storage Tank

2020 ◽  
Vol 34 (4) ◽  
pp. 04020077
Author(s):  
Iman Taji ◽  
Saeid Ghorbani ◽  
Reza Johari Teymoori ◽  
Mehrdad Hoseinpoor ◽  
Ali Davoodi ◽  
...  
Keyword(s):  
Reinforced Concrete ◽  
Storage Tank ◽  
Water Storage ◽  
Corrosion Performance ◽  
Water Storage Tank ◽  
Steel Rebars

Design recommendations for reinforced concrete cylindrical storage structures for aqueous materials

1987 ◽  
Vol 14 (4) ◽  
pp. 542-549
Author(s):  
J. C. Jofriet ◽  
R. Green ◽  
T. I. Campbell
Keyword(s):  
Reinforced Concrete ◽  
Tensile Stress ◽  
Limit State ◽  
Water Storage ◽  
Lateral Wall ◽  
Temperature Gradients ◽  
Design Criteria ◽  
Storage Reservoirs ◽  
Storage Structures ◽  
State Criterion

The design of cylindrical non-prestressed concrete storage structures in Ontario does not appear governed by any standard or building code. Many aboveground water storage reservoirs in Ontario have deteriorated badly in a relatively short period of use. Many farm silos suffer from problems similar to those of the water storage reservoirs. This paper is concerned with the selection of the wall thickness and the hoop reinforcement for cylindrical storage tanks and silos for liquids or wet materials where tensile cracking of the concrete is to be limited.Three design criteria are presented. The first limits the circumferential tensile stress in the concrete from lateral wall pressure, shrinkage, and temperature gradients in the wall. The second is concerned with the tension in the hoop reinforcement and guards against collapse. The third limits the crack widths of the cracked concrete section. The most important design loads are discussed. Maximum values for hoop tension are provided for liquid pressures. A design temperature gradient of 15 °C is recommended for design in southern Ontario. As well, appropriate values of shrinkage tensile stress are suggested. The collapse limit state criterion must be evaluated for the hoop steel stresses due to the lateral wall loads. The limit state criterion related to the hoop tensile stress in the concrete must be investigated for all possible load combinations of lateral wall load, shrinkage, and temperature gradients. Reasonable load combination factors have been recommended. Recommendations on the tensile strength of concrete and on appropriate strength factors have been made. Key words: cylindrical tank, design criteria, hoop stresses, reinforced concrete, silo, standpipe, storage of liquids, storage of saturated bulk materials.

scholarly journals Choice of parameters of oscillatory actions in the molding of reinforced concrete products

2018 ◽  
Vol 251 ◽  
pp. 03006
Author(s):  
Vitaly Vasiliev
Keyword(s):  
Shock Wave ◽  
Wave Propagation ◽  
Reinforced Concrete ◽  
Wave Packet ◽  
Experimental Studies ◽  
Concrete Mixture ◽  
Practical Recommendations

The process of propagation of a wave packet in the concrete mixture during the formation of reinforced concrete products by harmonic and shock-vibrational actions was considered. It was shown that the displacement of the layers of the concrete mixture during the propagation of the shock wave is directed against the direction of wave propagation, providing a sealing effect. On the basis of experimental studies, practical recommendations are given for determining the rational thickness of the compacted concrete mixture, depending on the frequency of oscillations.

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